06-26-2019
Yes, we can assume that it was dead slow. I waited for 20 minutes, before I hit reset button. since this was critical application server, I was not able to wait longer. From VMWare console, I checked and memory graph was not showing peak utilization. But I have seen behavior where server was frozen due to memory crunch and VMWare console doesn't show that. So your theory can be true in this case too.
VMWare platform is stable (over 300 VM servers are running on it) and none other VM complained about it and still have large amount of memory. Memory is capped to each VM. For example, for this affected VM, 8 GB of memory is allocated.
As a preventive action, I am looking for alert, if it happens again. There could be a small script running from other server and keep login to affected server and say "Login OK". As soon as it delays or not responding for 10-20 seconds, it will send email to admins. But we want to do it many servers and that will become a messy solution. HPOpenview is handled by different team, but they are not taking any initiative to advance on it. So I am looking for solution, if something can be done with this tool.
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LEARN ABOUT CENTOS
monitor
MONITOR(8) System Manager's Manual MONITOR(8)
NAME
monitor - Directory Server script for monitoring database performance
SYNOPSIS
monitor [ -Z serverID ] [ -D rootdn ] [ -w password ] [ -b basedn ] [-P protocol] [-h]
DESCRIPTION
Retrieves performance monitoring information. To run this script, the server must be running.
OPTIONS
A summary of options is included below:
-Z Server Identifier
The server ID of the Directory Server instance. If there is only one instance on the system, this option can be skipped.
-D Root DN
The Directory Manager DN, or root DN. If not specified, the script will search the server instance configuration for the value.
-w password
The rootdn password.
-b basedn
The DN of a backend from cn=config.
-P Protocol
The connection protocol to connect to the Directory Server. Protocols are STARTTLS, LDAPS, LDAPI, and LDAP. If this option is
skipped, the most secure protocol that is available is used. For LDAPI, AUTOBIND is also available for the root user.
-h
Display the usage.
EXAMPLE
monitor -P STARTTLS
Note: security must be enabled to use protocol STARTTLS. If STARTTLS is not available it will default to next strongest/available
protocol automatically.
monitor -Z instance2 -D 'cn=directory manager' -w password -b 'cn=monitor,cn=userRoot,cn=ldbm database,cn=plugins,cn=config'
Note: You only need to bind as the root DN if you want to look at a backend monitor.
DIAGNOSTICS
Exit status is zero if no errors occur. Errors result in a non-zero exit status and a diagnostic message being written to standard error.
AUTHOR
monitor was written by the 389 Project.
REPORTING BUGS
Report bugs to http://bugzilla.redhat.com.
COPYRIGHT
Copyright (C) 2013 Red Hat, Inc.
Mar 5, 2013 MONITOR(8)